Mitsubishi Eclipse. Manual — part 641
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1107
<When using the special tool MB991637 (fuel pressure
gauge set)>
1. Remove the union joint and bolt from special tool
MD998709 (adaptor hose) and instead attach special tool
MD998742 (hose adaptor) to the adaptor hose.
2. Install special tool MB991637 (fuel pressure gauge set) into
assembled special tools MD998709 and MD998742 via a
gasket.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and the fuel high-pressure hose.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
4. Connect scan tool MB991958 to the data link connector.
5. Use Actuator test 07 to drive the fuel pump. Check that there
is no fuel leaking from any section when the fuel pump is
operating.
6. Stop the fuel pump.
7. Start the engine and run at idle.
8. Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 270 kPa (79.7 in.Hg) at
curb idle
9. Disconnect the vacuum hose (blue stripe) from the fuel
pressure regulator and measure fuel pressure with the hose
end closed with your finger.
Standard value: 330
− 350 kPa (97.5 − 103 in.Hg) at
curb idle
10.Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
11.Revving the engine repeatedly, hold the fuel return hose
lightly with your fingers to feel that fuel pressure is present in
the return hose.
NOTE: If the fuel flow rate is low, there will be no fuel pres-
sure in the return hose.
12.If any of fuel pressure measured in steps 8 to 11 is out of
specification, troubleshoot and repair according to the table
below.
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
HIGH-
PRESSURE
FUEL HOSE
FUEL
RAIL
AB
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK000119
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1108
13.Stop the engine and observe fuel pressure gauge reading. It
is normal if the reading does not drop within two minutes. If it
does, observe the rate of drop and troubleshoot and repair
according to the table below. Start, then stop the engine.
(1) Squeeze the fuel return line closed to confirm leak-down
occurs from defective fuel pressure regulator.
(2) Squeeze the fuel supply line closed to confirm leak-down
occurs from defective fuel pump check valve.
(3) If pressure continues to drop with both fuel lines
squeezed closed, injector (s) are leaking.
14.Release residual pressure from the fuel pipe line. (Refer to
WARNING
Cover the hose connection with shop towels to pre-
vent splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
15.Remove the fuel pressure gauge, and special tools
MD998709, MD998742 and MB991637 from the fuel rail.
16.Replace the O-ring at the end of the fuel high-pressure hose
with a new one.
17.Fit the fuel high-pressure hose into the fuel rail and tighten
the bolts to specified torque.
Tightening torque: 4.9
± 1.0 N⋅m (43 ± 8 in-lb)
18.Check for fuel leaks.
(1) Use scan tool MB991958 to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.
19.Disconnect scan tool MB991958.
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after racing
• No fuel pressure in fuel return
hose
Clogged fuel filter
Replace fuel filter
Fuel leaking to return side due to
poor fuel regulator valve seating or
settled spring
Replace fuel pressure regulator
Low fuel pump delivery pressure
Replace fuel pump
Fuel pressure too high
Binding valve in fuel pressure
regulator
Replace fuel pressure regulator
Clogged fuel return hose or pipe
Clean or replace hose or pipe
Same fuel pressure when vacuum
hose is connected and when
disconnected
Damaged vacuum hose or
clogged nipple
Replace vacuum hose or clean
nipple
Defective fuel pressure regulator
Replace fuel pressure regulator
SYMPTOM
PROBABLE CAUSE
REMEDY
Fuel pressure drops gradually after
engine is stopped
Leaky injector
Replace injector
Leaky fuel regulator valve seat
Replace fuel pressure regulator
Fuel pressure drops sharply
immediately after engine is stopped
Check valve in fuel pump is held
open
Replace fuel pump
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1109
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900343
Refer to GROUP 13A, On-vehicle Service
− Fuel Pump Relay
Disconnection (How to Reduce Pressurized Fuel Lines)
.
FUEL PUMP OPERATION CHECK
M1131002000379
Refer to GROUP 13A, On-vehicle Service
− Fuel Pump Opera-
tion Check
.
MULTIPORT FUEL INJECTION (MFI) RELAY
CONTINUITY CHECK
M1131050000301
Refer to On-vehicle Service
− Multiport Fuel Injection (MFI)
Relay Continuity Check
FUEL PUMP RELAY CONTINUITY CHECK
M1131033000308
Refer to On-vehicle Service
− Fuel Pump Relay Continuity
Check
INTAKE AIR TEMPERATURE SENSOR CHECK
M1131002800483
Refer to On-vehicle Service
− Intake Air Temperature Sensor
Check
ENGINE COOLANT TEMPERATURE SENSOR
CHECK
M1131003100465
Refer to On-vehicle Service
− Engine Coolant Temperature
Sensor Check
THROTTLE POSITION SENSOR CHECK
M1131003200514
Required Special Tool:
• MB991348: Test Harness Set
.
Checking the Terminal Resistance
1. Disconnect the throttle position sensor connector.
2. Measure the resistance between throttle position sensor
side connector terminals No. 1 and No. 4.
Standard value: 3.5
− 6.5 kΩ
3. Measure the resistance between throttle position sensor
side connector terminals No. 1 and terminal No. 3.
Normal condition:
4. If the resistance is outside the standard value, or if it doesn't
change smoothly, replace the throttle position sensor.
Throttle valve slowly open
until fully open from the idle
position
Changes smoothly in
proportion to the opening
angle of the throttle valve
AKX01413
THROTTLE POSITION
SENSOR SIDE CONNECTOR
1 2 3 4
AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1110
NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to
.)
.
Check using oscilloscope
1. Disconnect the throttle position sensor connector and
connect the test harness special tool (MB991348) in
between. (All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position
sensor side connector terminal No. 3.
3. Turn the ignition switch to the "ON" position.
4. Slowly move the throttle lever from the idle position to the
full-throttle position and check then if the waveform is free
from any noise.
5. If any noise is recognized, replace the throttle position
sensor.
NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to
.)
HEATED OXYGEN SENSOR CHECK
M1131005000635
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• MD998464: Test Harness
• MB991316: Test Harness
• MB991658: Test Harness Set
.
<Right bank and left bank heated oxygen sensor (front)>
1. Use scan tool MB991958, observe HO
2
S reading. If values
are unsatisfactory, or if the scan tool is not available, use the
following procedure:
(1) Disconnect the heated oxygen sensor connector and
connect special tool MD998464 to the connector on the
heated oxygen sensor side.
AK102987AB
1 2 3 4
THROTTLE POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
MB991348
AKX01462AB
NORMAL WAVEFORM
THROTTLE LEVER
FULL-THROTTLE
POSITION
THROTTLE
LEVER
IDLE
POSITION
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